Hello, I am hoping that I can get some assistance on an issue I’ve been facing at work.  I am posting payments as credit card, and two or three a month show up as cash when we are balancing our accounts out.  I am new to business works.

I am concerned because I have been checking and rechecking my payments when I post them.  I have even screen shot the payments to prove that I am clicking the payments as credit when processing them, and two or three a month still show as cash, and my screen shots show I had credit selected.

So, I am wondering if these can be changed after the fact?  Is it possible to change a credit card payment to cash after I have posted it?  And if so, how can I tell that this has happened?  

Your help with this is greatly appreciated.  One more thing.  Where could I find a manual to help train myself on how to do everything I need to do for my company?  I believe I am intentionally not being trained correctly.  

Thank you in advance!